diff --git a/background.js b/background.js
index ba755d0..61d4b99 100644
--- a/background.js
+++ b/background.js
@@ -54,6 +54,7 @@ const tabsWaitingToLoad = {};
 const googleHostREs = [];
 const youtubeHostREs = [];
 const whitelistedHostREs = [];
+const allowlistedHostREs = [];
 
 async function isMACAddonEnabled () {
   try {
@@ -171,11 +172,23 @@ function generateWhitelistedHostREs () {
   }
 }
 
+function generateAllowlistedHostREs () {
+ if (allowlistedHostREs.length != 0) {return;}
+  const matchOperatorsRegex = /[|\\{}()[\]^$+*?.-]/g;
+  for (let allowlistedDomain of extensionSettings.allowlist) {
+    allowlistedDomain = allowlistedDomain.replace(matchOperatorsRegex, '\\$&');
+    allowlistedHostREs.push(new RegExp(`(^|\\.)${allowlistedDomain}$`));
+  }
+}
+
 async function loadExtensionSettings () {
   extensionSettings = await browser.storage.sync.get();
   if (extensionSettings.whitelist === undefined){
  	extensionSettings.whitelist = "";
   }
+  if (extensionSettings.allowlist === undefined){
+ 	extensionSettings.allowlist = "";
+  }
 }
 
 async function clearGoogleCookies () {
@@ -288,6 +301,17 @@ function isWhitelistedURL (url) {
   return false;
 }
 
+function isAllowlistedURL (url) {
+  generateAllowlistedHostREs();
+  const parsedUrl = new URL(url);
+  for (let allowlistedHostRE of allowlistedHostREs) {
+    if (allowlistedHostRE.test(parsedUrl.host)) {
+      return true;
+    }
+  }
+  return false;
+}
+
 function isSearchPageURL (url) {
   const parsedUrl = new URL(url);
   return parsedUrl.pathname.startsWith('/search');
@@ -319,7 +343,11 @@ function shouldContainInto (url, tab) {
     return false;
   }
 
-  let handleUrl = isGoogleURL(url);
+  let handleUrl = isGoogleURL(url) || (extensionSettings.allowlist.length!=0 && isAllowlistedURL(url));
+
+  if (handleUrl && extensionSettings.whitelist.length!=0 && isWhitelistedURL(url)) {
+    handleUrl = false;
+  }
 
   if (handleUrl && extensionSettings.ignore_youtube && isYouTubeURL(url)) {
     handleUrl = false;
@@ -345,10 +373,6 @@ function shouldContainInto (url, tab) {
     handleUrl = false;
   }
 
-  if (handleUrl && extensionSettings.whitelist.length!=0 && isWhitelistedURL(url)) {
-    handleUrl = false;
-  }
-
   if (handleUrl) {
     if (tab.cookieStoreId !== googleCookieStoreId) {
       if (tab.cookieStoreId !== "firefox-default" && extensionSettings.dont_override_containers) {
diff --git a/options.html b/options.html
index a5f3ddd..877f854 100644
--- a/options.html
+++ b/options.html
@@ -62,13 +62,23 @@ <h1>Settings</h1>
 			</label>
 		</p>
 
+		<p>
+			<label>
+				<textarea id="allowlist" value="" cols="80">
+				</textarea>
+				<br>
+				Include additional urls in Google Container<br>
+				<em>(Means use Google Container on these additional urls, e.g. for third party SSO or "Log in with Google". Use one url per line.)</em>
+			</label>
+		</p>
+
 		<p>
 			<label>
 				<textarea id="whitelist" value="" cols="80">
 				</textarea>
 				<br>
-				Whitelisted google urls<br>
-				<em>(Use one url per line.)</em>
+				Exclude Google urls in Google Container<br>
+				<em>(Means don't use Google Container on these Google urls. Use one url per line.)</em>
 			</label>
 		</p>
 
diff --git a/options.js b/options.js
index 2727c12..4eafd37 100644
--- a/options.js
+++ b/options.js
@@ -1,21 +1,21 @@
-function validate_whitelist() {
+function validate_list(htmlId) {
     domain_regex = /^(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]$/;
-    whitelist_element = document.querySelector("#whitelist");
-    if (whitelist_element.value == "") {return [];}
-    whitelist_domains = whitelist_element.value.split("\n");
+    list_element = document.querySelector(htmlId);
+    if (list_element.value == "") {return [];}
+    list_domains = list_element.value.split("\n");
     validated_domains = [];
-    for (whitelist_domain of whitelist_domains) {
-	if (whitelist_domain == "") {continue;}
-	if (whitelist_domain.match(domain_regex)) {validated_domains.push(whitelist_domain); continue;}
-	alert("'" + whitelist_domain + "' is not a valid domain.");
-	return [];
+    for (list_domain of list_domains) {
+	if (list_domain == "") {continue;}
+	if (list_domain.match(domain_regex)) {validated_domains.push(list_domain); continue;}
+	alert("'" + list_domain + "' is not a valid domain.");
+	continue;
     }
     return validated_domains;
 }
 
-function fill_whitelist_option(stored_whitelist) {
-    whitelist_text = (stored_whitelist === undefined) ? "" : stored_whitelist.join("\n");
-    document.querySelector("#whitelist").value = whitelist_text ? whitelist_text : "";
+function fill_list_option(stored_list, idHtml) {
+    list_text = (stored_list === undefined) ? "" : stored_list.join("\n");
+    document.querySelector(idHtml).value = list_text ? list_text : "";
 }
 
 
@@ -30,8 +30,9 @@ function onOptionsPageSave(e)
 		"ignore_prefpages": document.querySelector("#ignore_prefpages").checked,
 		"ignore_maps": document.querySelector("#ignore_maps").checked,
 		"ignore_flights": document.querySelector("#ignore_flights").checked,
-	        "dont_override_containers": document.querySelector("#dont_override_containers").checked,
-	        "whitelist": validate_whitelist()
+		"dont_override_containers": document.querySelector("#dont_override_containers").checked,
+		"whitelist": validate_list("#whitelist"),
+		"allowlist": validate_list("#allowlist")
 	});
 
 	browser.runtime.reload();
@@ -49,7 +50,8 @@ function onOptionsPageLoaded()
 		document.querySelector("#ignore_maps").checked = res.ignore_maps || false;
 		document.querySelector("#ignore_flights").checked = res.ignore_flights || false;
 		document.querySelector("#dont_override_containers").checked = res.dont_override_containers || false;
-	        fill_whitelist_option(res.whitelist);
+	        fill_list_option(res.whitelist, "#whitelist");
+	        fill_list_option(res.allowlist, "#allowlist");
 	});
 }